Apple iMac G5, 20-inch - Manual (Page 122)

120 - iMac G5 (20-inch) Take Apart Midplane Assembly
15. Rotate the computer clockwise so you see the inverter cables as shown below. Tilt the
inverter to access the two white cable connectors.
16. Disconnect the cables by pulling on the connector, not on the cables. Disconnect the
smaller connector first.
17. Lift the inverter out of the computer. Disconnect the black connector (circled below)
located under the gray fan duct. Gently pull the black cable to disconnect the
connector. Shift the hard drive to the right if you need more room to access the cable.